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arXiv 1601.01211math.CO
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固定边密度图中4-边路的密度

Density of 4-edge paths in graphs with fixed edge density

Dániel T. Nagy

摘要:

研究了顶点数和边数均固定的图中4-边路的个数。给出了这个量的一个渐近尖锐的上界。极值结构是拟星或拟团图,取决于边密度。证明了一个简单的下界。这个答案类似于经典的定理Ahlswede和Katona关于最大数目的2-边缘路径,和最近的定理Kenyon,Radin,Ren和Sadun关于k-边缘星。

英文摘要:

We investigate the number of 4-edge paths in graphs with a fixed number of vertices and edges. An asymptotically sharp upper bound is given to this quantity. The extremal construction is the quasi-star or the quasi-clique graph, depending on the edge density. An easy lower bound is also proved. This answer resembles the classic theorem of Ahlswede and Katona about the maximal number of 2-edge paths, and a recent theorem of Kenyon, Radin, Ren and Sadun about k-edge stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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